Journal Article

FZJ-2020-02830

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Temperature-Induced Stress Relaxation in Alloyed Silver–Gold Nanoparticles (7–8 nm) by in Situ X-ray Powder Diffraction

Prymak, O. ; Grasmik, V. ; Loza, K. ; Heggen, M.FZJ* ; Epple, M. (Corresponding author)

2020
ACS Publ. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/25741  doi:10.1021/acs.cgd.9b00728

Abstract: Alloyed silver–gold nanoparticles (spherical, 8 nm) were wet-chemically prepared by reduction with sodium citrate/tannic acid and colloidally stabilized by poly(N-vinylpyrrolidone) (PVP), in steps of 10 atom %, including pure silver nanoparticles (35 nm) and pure gold nanoparticles (7 nm). The nanoparticles were subjected to in situ X-ray powder diffraction up to 850 °C to induce internal stress relaxation and recrystallization. The stress-induced negative deviation from Vegard’s rule that was present in the original alloyed nanoparticles vanished between 150 and 250 °C, indicating the internal healing of defects. Simultaneously, a discontinuous increase in the crystallite size and a drop in the microstrain were observed. After heating to 850 °C, the original gradient structure (silver-rich shell, gold-rich core) had changed to a homogeneous elemental distribution as shown by high-angle annular dark-field scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy (STEM/EDX). Thus, there is a considerable mobility of the metal atoms inside the nanoparticles that starts as low as 150 °C.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. DFG project 286659497 - Bimetallische Nanopartikel der Platinmetalle (Ru, Rh, Pd, Os, Ir, Pt) und des Silbers: Synthese, Mikrostruktur und biologische Wirkung (286659497) (286659497)
3. DFG project 257727131 - Nanoskalige Pt Legierungselektrokatalysatoren mit definierter Morphologie: Synthese, Electrochemische Analyse, und ex-situ/in-situ Transmissionselektronenmikroskopische (TEM) Studien (257727131) (257727131)

Appears in the scientific report 2020

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Database coverage:
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